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I'm working on adding a woodstove to a yurt. The chimney will go out a sidewall and then head up. There is not a good way to brace the chimney to the yurt itself.

Here are some options I've read about, but don't know how to judge:

  • Use a pair of 4"x4" treated posts. Bed them in the ground in concrete. This is what the yurt manufacturer recommends: enter image description here

  • Build a wooden frame to support the chimney. Pairs of 2"x6"s joined in L-shapes as the corner. Attached to a poured concrete footing w/ 2"x6" treated "sill plates". Could be covered with sheathing & siding.

  • Build a masonry column to support the chimney, like this:

enter image description here

  • Put a metal pole in the ground, strap the chimney to it. Not sure what kind of pole, or size. Here are some pictures of this:

enter image description here enter image description here

Any other suggestions?

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How tall is the flue going to be from the ground to the top? –  shirlock homes Sep 2 '11 at 10:40
    
The metal pole idea looks promising. How big is the chimney? How heavy is it? How high are the winds near you? –  Alex Feinman Sep 2 '11 at 14:15
    
The bottom of the chimney is about 8' above grade; the top about 16' above grade. I don't have the chimney yet, but I'm assuming Metalbestos 6". Winds here are very mild, as we're protected by the forest even in windstorms. –  Jay Bazuzi Sep 2 '11 at 19:37

3 Answers 3

My first inclination would be to install a concrete footing 3 or 4 feet deep by maybe 1 1/2 to 2 feet square. Put a concrete block or paver in the bottom of the hole to support the pipe. Plumb the pipe (2 or 3 inch galv should work well) with some temp 2X4 braces, then pour concrete into your hole. Be sure to crown the top of the footing a little so water will drain off and not pool around the pipe. The reason I like a large footing is to supply good ballast and avoid any frost heaves.(if you get ground freeze in WA.) Also, don't forget to put a cap on the top of the pipe so water will not fill the pipe. You may also want to paint the pipe with Rustoleum before attaching the stainless straps to the flue. This will help avoid any reaction from dislike metals in contact with each other.

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I,too am dealing with the same situation. The side where my stove pipe opening is, is actually 12' off the ground-the yurt is on a slope. So I am doing a combo of suggestions. Cement is poured, I will use a 4x4x16' post anchored in that cement. Then I will use 2 more 4x4x16' post to create a triangle. They will be buried in the ground about 1'. They will be closest to the yurt. Then above the T part of the chimney I will create a square frame with 2x4's attached to the triangle to support the chimney. I have a lot of wind where I am and given how high up it will be I want additional support at the top. I will post pics when I am done. Corina

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We have a house that is one storey in places and two storey in others. The chimney is freestanding above the first storey. Recently we added a second-storey room, and had to extend the chimney so it was enough above the new roofline. This meant about 13 feet of freestanding.

chimney

You can see it's well connected and footed at the base.

We were required by code to add a "saddle" that braced it back to our roof. Here you can see them working with a mockup:

mock brace

The real brace went back with a flat line, not that angle as the mockup. The masons built the chimney with flat spots to make it easier to caulk the saddle.

flat spot

Eventually the saddle was finished just like the roof, including vents. Here it is in progress:

brace partly finished

Your saddle would probably be very similar.

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4  
Great answer, with loads of pictures, but probably not relevant in this case--yurt walls aren't rigid and connecting the chimney to them would probably be counterproductive. –  Alex Feinman Sep 2 '11 at 14:14
    
Note that those are also called "Crickets" -- I agree, great answer, but it's probably not the right one for this question. –  Karl Katzke Sep 2 '11 at 19:49

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